[54] ANTENNA
[75] Inventor: Timo Saari, Pori, Finland
[73] Assignee: Nokia Mobile Phones, Ltd., Espoo, Finland
[21] Appl. No.: 09/252,159 [22] Filed: Feb. 18, 1999
[51] Int. CI.7 H01Q 1/24; H01Q 1/38
[52] U.S. CI 343/702; 343/895; 343/700 MS
[58] Field of Search 343/702, 895,
343/700 MS; H01Q 1/24, 1/38
[56] References Cited
U.S. PATENT DOCUMENTS
4,860,019 8/1989 liang et al 343/795
4,998,078 3/1991 Hulkko 333/109
5.276,920 1/1994 Kuisma 455/101
5.341,149 8/1994 Valimaa et al 343/895
5,363,114 11/1994 Shoemaker 343/828
5,412,392 5/1995 Tsunekawa 343/702
5,561,439 10/1996 Moilanen 343/846
5,627,550 5/1997 Sanad 343/700 MS
5.657,028 8/1997 Sanad 343/700 MS
5.680,144 10/1997 Sanad 343/700 MS
5.832,372 11/1998 Clelland et al 455/115
5,854,970 12/1998 Kivela 455/90
The invention comprises an antenna structure particularly suited for mobile stations. The antenna comprises a radiating element (100) which is ol a conductor form. The antenna conductor comprises a basic conductor and as an extension to this a conductor (115,116) which at least partly is located relatively close to the basic conductor. As the conductors are close to each other that causes an electromagnetic coupling, which again causes a second resonance frequency for the antenna. The bandwidth ol the antenna can be widened when the second resonance frequency is arranged close to the first one. The antenna can be made as a two-band antenna when the second resonance frequency is arranged relatively lar from the first one. The bands can be made relatively wide, so that the antenna operates satislactorily in different positions and in the neighbourhood ol objects. It can be lastened to the back wall ol a mobile station, whereby the distance to the user's head is made as large as possible.
15 Claims, 3 Drawing Sheets
